| Location or Site |
Orville Hickman Browning's House, Quincy, IL |
Quincy, IL |
| City or Town |
Orwell, VT |
Addison County, VT |
| County |
Osage County, KS |
Kansas |
| County |
Osage County, MO |
Missouri |
| City or Town |
Osage, TX |
Coryell County, TX |
| City or Town |
Osawatomie, KS |
Lykins County, KS |
| County |
Osceola County, MI |
Michigan |
| County |
Oscoda County, MI |
Michigan |
| City or Town |
Oshkosh, WI |
Winnebago County, WI |
| City or Town |
Oskaloosa, IA |
Mahaska County, IA |
| City or Town |
Oslo, Norway |
Norway |
| City or Town |
Ossining, NY |
Westchester County, NY |
| City or Town |
Ostend, Belgium |
Belgium |
| County |
Oswego County, NY |
New York |
| City or Town |
Oswego, NY |
Oswego County, NY |
| County |
Otsego County, MI |
Michigan |
| County |
Otsego County, NY |
New York |
| County |
Ottawa County, KS |
Kansas |
| County |
Ottawa County, MI |
Michigan |
| County |
Ottawa County, OH |
Ohio |
| City or Town |
Ottawa, Canada West |
Canada West (Ontario) |
| City or Town |
Ottawa, IL |
La Salle County, IL |
| City or Town |
Ottawa, KS |
Franklin County, KS |
| Location or Site |
Otto Farm, South Middleton Township, PA |
South Middleton Township, PA |
| Region |
Ottoman Empire |
Middle East |
| County |
Ouachita County, AR |
Arkansas |
| County |
Outagamie County, WI |
Wisconsin |
| County |
Overton County, TN |
Tennessee |
| City or Town |
Owego, NY |
Tioga County, NY |
| County |
Owen County, IN |
Indiana |
